Compensating NMOS LDO regulator using auxiliary amplifier

Details Compensating NMOS LDO regulator using auxiliary amplifier Compensating NMOS LDO regulator using auxiliary amplifier

2007-01-17

2008-11-04

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S275000

Reexamination Certificate

active

07446515

ABSTRACT:
An LDO (low dropout) regulator including a pass transistor having a first electrode coupled to produce an output voltage of the LDO regulator, a control electrode, and a second electrode coupled to receive an input voltage of the LDO regulator. An error amplifier has a first input coupled to a first reference voltage and an output coupled to the gate control electrode of the pass transistor. A first feedback circuit has an input coupled to the first electrode of the pass transistor and an output producing a first feedback voltage coupled to a second input of the error amplifier. The auxiliary amplifier has a first input coupled to a second reference voltage and an output coupled to the output of the error amplifier. A second feedback circuit has an input coupled to the output of the auxiliary amplifier and an output producing a second feedback voltage coupled to a second input of the auxiliary amplifier. The auxiliary feedback loop is used to take over control of the feedback in the LDO regulator at high frequencies.

REFERENCES:
patent: 5982226 (1999-11-01), Rincon-Mora
patent: 6861827 (2005-03-01), Yang et al.
patent: 7015680 (2006-03-01), Moraveji et al.

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